On Fri, 21 Nov 2025 21:40:57 GMT, Andy Goryachev <[email protected]> wrote:
>> Implementation of the >> [linear](https://www.w3.org/TR/css-easing-2/#the-linear-easing-function) >> easing function, which is now widely supported by all browsers, but still >> missing in JavaFX. >> >> It allows developers to approximate arbitrary easing functions with linear >> segments: >> >> >> linear( >> /* Start to 1st bounce */ >> 0, 0.063, 0.25, 0.563, 1 36.4%, >> /* 1st to 2nd bounce */ >> 0.812, 0.75, 0.813, 1 72.7%, >> /* 2nd to 3rd bounce */ >> 0.953, 0.938, 0.953, 1 90.9%, >> /* 3rd bounce to end */ >> 0.984, 1 100% 100% >> ) >> >> >> <img >> src="https://github.com/user-attachments/assets/73aac0d4-0185-47c5-8791-bdb247eb69c8"; >> width="400"/> > > modules/javafx.graphics/src/main/java/com/sun/scenario/animation/LinearInterpolator.java > line 76: > >> 74: // Ensure that the input progress value of each control point is >> greater than or equal to the >> 75: // input progress values of all preceding control points >> (monotonically non-decreasing). >> 76: double largestX = controlPoints[0]; > > Question: what happens when a esquence is specified which is somehow invalid? > Will it throw an exception, write to stderr, or silently ignore? > > (I can't think of an invalid sequence, maybe `0, 0 0% 0%, 0 -10%, NaN` ?) The sequence will always be successfully canonicalized, so there's never a log output or exception. In your example, the canonicalized easing function will be 0 for t=0, and NaN for t>0. If you use this function in an animation, you may get weird values and undefined things may happen. This is not unique to easing functions: we almost never handle NaNs in JavaFX. For example, you can construct a `Color` with NaN components (which is what would happen if you used your easing function in a color transition). ------------- PR Review Comment: https://git.openjdk.org/jfx/pull/1977#discussion_r2552633277
